1 LED green for SD card access (SD)1 LED red for BAT1 LED green for SL1 LED red for I/O error (I/O)1 LED red for bus fault on TM4 (TM4)1 LED green for Ethernet activity (ETH1)1 LED green for Ethernet activity (ETH2)1 LED red for module error (ERR)1 LED green for PWR1 LED green for RUN